mysql_async 0.3.0

Tokio based asynchronous MySql client library.
Documentation 
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// Copyright (c) 2016 Anatoly Ikorsky
//
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. All files in the project carrying such notice may not be copied,
// modified, or distributed except according to those terms.

use errors::*;
use io::Stream;
use lib_futures::Async;
use lib_futures::Async::Ready;
use lib_futures::Failed;
use lib_futures::failed;
use lib_futures::Future;
use lib_futures::Poll;
use lib_futures::future::select_ok;
use lib_futures::future::SelectOk;
use proto::NewPacket;
use std::collections::VecDeque;
use std::io;
use std::net::ToSocketAddrs;
use tokio::net::TcpStream;
use tokio::net::TcpStreamNew;
use tokio::reactor::Handle;


steps! {
    ConnectingStream {
        WaitForStream(SelectOk<TcpStreamNew>),
        Fail(Failed<(), Error>),
    }
}

/// Future that resolves to a `Stream` connected to a MySql server.
pub struct ConnectingStream {
    step: Step,
}

pub fn new<S>(addr: S, handle: &Handle) -> ConnectingStream
    where S: ToSocketAddrs,
{
    match addr.to_socket_addrs() {
        Ok(addresses) => {
            let mut streams = Vec::new();

            for address in addresses {
                streams.push(TcpStream::connect(&address, handle));
            }

            if streams.len() > 0 {
                ConnectingStream { step: Step::WaitForStream(select_ok(streams)) }
            } else {
                let err = io::Error::new(io::ErrorKind::InvalidInput,
                                         "could not resolve to any address");
                ConnectingStream { step: Step::Fail(failed(err.into())) }
            }
        },
        Err(err) => ConnectingStream { step: Step::Fail(failed(err.into())) },
    }
}

impl Future for ConnectingStream {
    type Item = Stream;
    type Error = Error;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        match try_ready!(self.either_poll()) {
            Out::WaitForStream((stream, _)) => {
                Ok(Ready(Stream {
                    closed: false,
                    next_packet: Some(NewPacket::empty().parse()),
                    buf: Some(VecDeque::new()),
                    endpoint: Some(stream),
                }))
            },
            Out::Fail(_) => unreachable!(),
        }
    }
}